body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100vh;
    background-color: #f0f0f0;
}

#toolbar {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

#toolbar button {
    margin: 0 10px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
}

#paper-container {
    width: 800px;
    height: 600px;
    border: 1px solid #ccc;
    background-color: white;
}